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  • mad_mat commented on ludektalian's instructable Speed HeadUp Display1 year ago
    Speed HeadUp Display

    Hi Ludektalian, nice job mate, well done.Yours is done, but if you need to re-work the code or if anyone else has a go, here is a link to a page with a list of NMEA strings:http://www.gpsinformation.org/dale/nmea.htmI use it regularly! Some provide kph (or mph) without conversion and some have much easier formatting to parse without using GPS libraries. And because they are always the same, you can just count commas until you get to the field you need. For eg GPVTG; count 7 commas and the next integer is kph rounded down. You can do away with the hardware LED's for determining fix state (none, 2D or 3D) fix as many NMEA strings include a field for current fix state.Whichever GPS engine hardware you use will determine what string(s) are output by default but most have a selection you can...

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    Hi Ludektalian, nice job mate, well done.Yours is done, but if you need to re-work the code or if anyone else has a go, here is a link to a page with a list of NMEA strings:http://www.gpsinformation.org/dale/nmea.htmI use it regularly! Some provide kph (or mph) without conversion and some have much easier formatting to parse without using GPS libraries. And because they are always the same, you can just count commas until you get to the field you need. For eg GPVTG; count 7 commas and the next integer is kph rounded down. You can do away with the hardware LED's for determining fix state (none, 2D or 3D) fix as many NMEA strings include a field for current fix state.Whichever GPS engine hardware you use will determine what string(s) are output by default but most have a selection you can pick from with simple commands to the GPS engine after power on. Product Documentation or google will tell you how to turn on or off NMEA strings and at what rate to send them out (1hz is plenty fast enough for a car speedo).Great work Ludektalian.

    Here are two documents for the Neo M8N:Datasheet: https://www.u-blox.com/sites/default/files/NEO-M8_...Receiver Description and Protocol specification: https://www.u-blox.com/sites/default/files/NEO-M8_...For my previous example, the Neo M8N outputs VTG by default so no settings required; Datasheet, Section 8 (pp23).

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